package com.bxd.baodan.probe;

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

/**
 * Created by Administrator on 2017/12/12.
 */

public class AESEncode {
    /**
     * 加密
     *
     * @param src 需要加密的内容
     * @param key  加密密码
     * @return
     */
//    public static byte[] encrypt(String content, String password) {
//        try {
//            KeyGenerator kgen = KeyGenerator.getInstance("AES");
//            kgen.init(128, new SecureRandom(password.getBytes()));
//            SecretKey secretKey = kgen.generateKey();
//            byte[] enCodeFormat = secretKey.getEncoded();
//            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
//            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
//            byte[] byteContent = content.getBytes("utf-8");
//            cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
//            byte[] result = cipher.doFinal(byteContent);
//            return result; // 加密
//        } catch (NoSuchAlgorithmException e) {
//            e.printStackTrace();
//        } catch (NoSuchPaddingException e) {
//            e.printStackTrace();
//        } catch (InvalidKeyException e) {
//            e.printStackTrace();
//        } catch (UnsupportedEncodingException e) {
//            e.printStackTrace();
//        } catch (IllegalBlockSizeException e) {
//            e.printStackTrace();
//        } catch (BadPaddingException e) {
//            e.printStackTrace();
//        }
//        return null;
//    }

    public static byte[] encrypt(String src, String key) throws Exception {
       return encrypt(src.getBytes(),key.getBytes());
    }

    public static byte[] encrypt( byte[] src,byte[] key) throws Exception {
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(new byte[cipher.getBlockSize()]));
        byte[] encrypted = cipher.doFinal(src);
        return encrypted;
    }

    /**解密
     * @param content  待解密内容
     * @param password 解密密钥
     * @return
     */
    public static byte[] decrypt(byte[] content, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            kgen.init(128, new SecureRandom(password.getBytes()));
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
            cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(content);
            return result; // 加密
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**将16进制转换为二进制
     * @param hexStr
     * @return
     */
    public static byte[] parseHexStr2Byte(String hexStr) {
        if (hexStr.length() < 1)
            return null;
        byte[] result = new byte[hexStr.length()/2];
        for (int i = 0;i< hexStr.length()/2; i++) {
            int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);
            int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);
            result[i] = (byte) (high * 16 + low);
        }
        return result;
    }

    /**将二进制转换成16进制
     * @param buf
     * @return
     */
    public static String parseByte2HexStr(byte buf[]) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < buf.length; i++) {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }


}
